Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df37ce0e02e976e89da362d52726d0cc513f77cc397429e0bc901b82ebd1b55b' 
  AND token = 'EFputuYNP3jauQntsGYuDDkgdW/whugZdKBuDsorOnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}